diff --git a/java/res/values/donottranslate.xml b/java/res/values/donottranslate.xml
index 70ace77..36412b4 100644
--- a/java/res/values/donottranslate.xml
+++ b/java/res/values/donottranslate.xml
@@ -29,19 +29,6 @@
     <string name="symbols_word_separators">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
     <!-- Word connectors -->
     <string name="symbols_word_connectors">\'-</string>
-    <!-- Symbol characters list that should switch back to the main layout -->
-    <!-- U+2018: "‘" LEFT SINGLE QUOTATION MARK
-         U+2019: "’" RIGHT SINGLE QUOTATION MARK
-         U+201A: "‚" SINGLE LOW-9 QUOTATION MARK
-         U+201B: "‛" SINGLE HIGH-REVERSED-9 QUOTATION MARK
-         U+201C: "“" LEFT DOUBLE QUOTATION MARK
-         U+201D: "”" RIGHT DOUBLE QUOTATION MARK
-         U+201E: "„" DOUBLE LOW-9 QUOTATION MARK
-         U+201F: "‟" DOUBLE HIGH-REVERSED-9 QUOTATION MARK
-         U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
-         U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK -->
-    <!-- <string name="layout_switch_back_symbols">\"\'&#x2018;&#x2019;&#x201A;&#x201B;&#x201C;&#x201D;&#x201E;&#x201F;&#x00AB;&#x00BB;</string> -->
-    <string name="layout_switch_back_symbols"></string>
 
     <!--  Always show the suggestion strip -->
     <string name="prefs_suggestion_visibility_show_value">0</string>
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index bc9dbc0..bad9a8a 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -149,7 +149,7 @@
                 settingsValues.isLanguageSwitchKeyEnabled());
         mKeyboardLayoutSet = builder.build();
         try {
-            mState.onLoadKeyboard(mResources.getString(R.string.layout_switch_back_symbols));
+            mState.onLoadKeyboard();
             mFeedbackManager.onSettingsChanged(settingsValues);
         } catch (KeyboardLayoutSetException e) {
             Log.w(TAG, "loading keyboard failed: " + e.mKeyboardId, e.getCause());
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
index 25a1c6a..5a77044 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
@@ -26,7 +26,7 @@
  *
  * This class contains all keyboard state transition logic.
  *
- * The input events are {@link #onLoadKeyboard(String)}, {@link #onSaveKeyboardState()},
+ * The input events are {@link #onLoadKeyboard()}, {@link #onSaveKeyboardState()},
  * {@link #onPressKey(int, boolean, int)}, {@link #onReleaseKey(int, boolean)},
  * {@link #onCodeInput(int, boolean, int)}, {@link #onCancelInput(boolean)},
  * {@link #onUpdateShiftState(int)}, {@link #onLongPressTimeout(int)}.
@@ -74,7 +74,6 @@
     private static final int SWITCH_STATE_MOMENTARY_ALPHA_AND_SYMBOL = 3;
     private static final int SWITCH_STATE_MOMENTARY_SYMBOL_AND_MORE = 4;
     private int mSwitchState = SWITCH_STATE_ALPHA;
-    private String mLayoutSwitchBackSymbols;
 
     private boolean mIsAlphabetMode;
     private AlphabetShiftState mAlphabetShiftState = new AlphabetShiftState();
@@ -109,15 +108,14 @@
         }
     }
 
-    public KeyboardState(SwitchActions switchActions) {
+    public KeyboardState(final SwitchActions switchActions) {
         mSwitchActions = switchActions;
     }
 
-    public void onLoadKeyboard(String layoutSwitchBackSymbols) {
+    public void onLoadKeyboard() {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onLoadKeyboard: " + this);
         }
-        mLayoutSwitchBackSymbols = layoutSwitchBackSymbols;
         // Reset alphabet shift state.
         mAlphabetShiftState.setShiftLocked(false);
         mPrevMainKeyboardWasShiftLocked = false;
@@ -177,7 +175,7 @@
     private static final int AUTOMATIC_SHIFT = 2;
     private static final int SHIFT_LOCK_SHIFTED = 3;
 
-    private void setShifted(int shiftMode) {
+    private void setShifted(final int shiftMode) {
         if (DEBUG_ACTION) {
             Log.d(TAG, "setShifted: shiftMode=" + shiftModeToString(shiftMode) + " " + this);
         }
@@ -216,7 +214,7 @@
         }
     }
 
-    private void setShiftLocked(boolean shiftLocked) {
+    private void setShiftLocked(final boolean shiftLocked) {
         if (DEBUG_ACTION) {
             Log.d(TAG, "setShiftLocked: shiftLocked=" + shiftLocked + " " + this);
         }
@@ -313,7 +311,7 @@
         mSwitchState = SWITCH_STATE_SYMBOL_BEGIN;
     }
 
-    public void onPressKey(int code, boolean isSinglePointer, int autoCaps) {
+    public void onPressKey(final int code, final boolean isSinglePointer, final int autoCaps) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onPressKey: code=" + Constants.printableCode(code)
                    + " single=" + isSinglePointer + " autoCaps=" + autoCaps + " " + this);
@@ -346,7 +344,7 @@
         }
     }
 
-    public void onReleaseKey(int code, boolean withSliding) {
+    public void onReleaseKey(final int code, final boolean withSliding) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onReleaseKey: code=" + Constants.printableCode(code)
                     + " sliding=" + withSliding + " " + this);
@@ -364,7 +362,7 @@
         mSwitchState = SWITCH_STATE_MOMENTARY_ALPHA_AND_SYMBOL;
     }
 
-    private void onReleaseSymbol(boolean withSliding) {
+    private void onReleaseSymbol(final boolean withSliding) {
         if (mSymbolKeyState.isChording()) {
             // Switch back to the previous keyboard mode if the user chords the mode change key and
             // another key, then releases the mode change key.
@@ -378,7 +376,7 @@
         mSymbolKeyState.onRelease();
     }
 
-    public void onLongPressTimeout(int code) {
+    public void onLongPressTimeout(final int code) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onLongPressTimeout: code=" + Constants.printableCode(code) + " " + this);
         }
@@ -388,7 +386,7 @@
         }
     }
 
-    public void onUpdateShiftState(int autoCaps) {
+    public void onUpdateShiftState(final int autoCaps) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onUpdateShiftState: autoCaps=" + autoCaps + " " + this);
         }
@@ -404,7 +402,7 @@
         resetKeyboardStateToAlphabet();
     }
 
-    private void updateAlphabetShiftState(int autoCaps) {
+    private void updateAlphabetShiftState(final int autoCaps) {
         if (!mIsAlphabetMode) return;
         if (!mShiftKeyState.isReleasing()) {
             // Ignore update shift state event while the shift key is being pressed (including
@@ -468,7 +466,7 @@
         }
     }
 
-    private void onReleaseShift(boolean withSliding) {
+    private void onReleaseShift(final boolean withSliding) {
         if (mIsAlphabetMode) {
             final boolean isShiftLocked = mAlphabetShiftState.isShiftLocked();
             mIsInAlphabetUnshiftedFromShifted = false;
@@ -523,7 +521,7 @@
         mShiftKeyState.onRelease();
     }
 
-    public void onCancelInput(boolean isSinglePointer) {
+    public void onCancelInput(final boolean isSinglePointer) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onCancelInput: single=" + isSinglePointer + " " + this);
         }
@@ -542,17 +540,11 @@
                 || mSwitchState == SWITCH_STATE_MOMENTARY_SYMBOL_AND_MORE;
     }
 
-    private static boolean isSpaceCharacter(int c) {
+    private static boolean isSpaceCharacter(final int c) {
         return c == Constants.CODE_SPACE || c == Constants.CODE_ENTER;
     }
 
-    private boolean isLayoutSwitchBackCharacter(int c) {
-        if (TextUtils.isEmpty(mLayoutSwitchBackSymbols)) return false;
-        if (mLayoutSwitchBackSymbols.indexOf(c) >= 0) return true;
-        return false;
-    }
-
-    public void onCodeInput(int code, boolean isSinglePointer, int autoCaps) {
+    public void onCodeInput(final int code, final boolean isSinglePointer, final int autoCaps) {
         if (DEBUG_EVENT) {
             Log.d(TAG, "onCodeInput: code=" + Constants.printableCode(code)
                     + " single=" + isSinglePointer
@@ -592,17 +584,11 @@
                     || code == Constants.CODE_OUTPUT_TEXT)) {
                 mSwitchState = SWITCH_STATE_SYMBOL;
             }
-            // Switch back to alpha keyboard mode immediately if user types one of the switch back
-            // characters.
-            if (isLayoutSwitchBackCharacter(code)) {
-                toggleAlphabetAndSymbols();
-                mPrevSymbolsKeyboardWasShifted = false;
-            }
             break;
         case SWITCH_STATE_SYMBOL:
             // Switch back to alpha keyboard mode if user types one or more non-space/enter
-            // characters followed by a space/enter or one of the switch back characters.
-            if (isSpaceCharacter(code) || isLayoutSwitchBackCharacter(code)) {
+            // characters followed by a space/enter.
+            if (isSpaceCharacter(code)) {
                 toggleAlphabetAndSymbols();
                 mPrevSymbolsKeyboardWasShifted = false;
             }
@@ -615,7 +601,7 @@
         }
     }
 
-    private static String shiftModeToString(int shiftMode) {
+    private static String shiftModeToString(final int shiftMode) {
         switch (shiftMode) {
         case UNSHIFT: return "UNSHIFT";
         case MANUAL_SHIFT: return "MANUAL";
@@ -624,7 +610,7 @@
         }
     }
 
-    private static String switchStateToString(int switchState) {
+    private static String switchStateToString(final int switchState) {
         switch (switchState) {
         case SWITCH_STATE_ALPHA: return "ALPHA";
         case SWITCH_STATE_SYMBOL_BEGIN: return "SYMBOL-BEGIN";
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateSingleTouchTests.java b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateSingleTouchTests.java
index a1ceb8e..74ff879 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateSingleTouchTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateSingleTouchTests.java
@@ -150,59 +150,6 @@
         pressAndReleaseKey(CODE_SPACE, SYMBOLS_SHIFTED, ALPHABET_SHIFT_LOCKED);
     }
 
-    // Automatic switch back to alphabet by registered letters.
-    public void testSwitchBackChar() {
-        // Set switch back chars.
-        final String switchBackSymbols = "'";
-        final int switchBackCode = switchBackSymbols.codePointAt(0);
-        setLayoutSwitchBackSymbols(switchBackSymbols);
-        loadKeyboard(ALPHABET_UNSHIFTED);
-
-        // Press/release "?123" key, enter into symbols.
-        pressAndReleaseKey(CODE_SYMBOL, SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Enter symbol letter.
-        pressAndReleaseKey('1', SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Enter switch back letter, switch back to alphabet.
-        pressAndReleaseKey(switchBackCode, SYMBOLS_UNSHIFTED, ALPHABET_UNSHIFTED);
-
-        // Press/release "?123" key, enter into symbols.
-        pressAndReleaseKey(CODE_SYMBOL, SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Press/release "=\<" key, enter into symbols shifted.
-        pressAndReleaseKey(CODE_SHIFT, SYMBOLS_SHIFTED, SYMBOLS_SHIFTED);
-        // Enter symbol shift letter.
-        pressAndReleaseKey('~', SYMBOLS_SHIFTED, SYMBOLS_SHIFTED);
-        // Enter switch abck letter, switch back to alphabet.
-        pressAndReleaseKey(switchBackCode, SYMBOLS_SHIFTED, ALPHABET_UNSHIFTED);
-    }
-
-    // Automatic switch back to alphabet shift locked by registered letters.
-    public void testSwitchBackCharShiftLocked() {
-        // Set switch back chars.
-        final String switchBackSymbols = "'";
-        final int switchBackCode = switchBackSymbols.codePointAt(0);
-        setLayoutSwitchBackSymbols(switchBackSymbols);
-        loadKeyboard(ALPHABET_UNSHIFTED);
-        // Long press shift key, enter alphabet shift locked.
-        longPressAndReleaseKey(CODE_SHIFT, ALPHABET_MANUAL_SHIFTED, ALPHABET_MANUAL_SHIFTED,
-                ALPHABET_SHIFT_LOCKED);
-
-        // Press/release "?123" key, enter into symbols.
-        pressAndReleaseKey(CODE_SYMBOL, SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Enter symbol letter.
-        pressAndReleaseKey('1', SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Enter switch back letter, switch back to alphabet shift locked.
-        pressAndReleaseKey(switchBackCode, SYMBOLS_UNSHIFTED, ALPHABET_SHIFT_LOCKED);
-
-        // Press/release "?123" key, enter into symbols.
-        pressAndReleaseKey(CODE_SYMBOL, SYMBOLS_UNSHIFTED, SYMBOLS_UNSHIFTED);
-        // Press/release "=\<" key, enter into symbols shifted.
-        pressAndReleaseKey(CODE_SHIFT, SYMBOLS_SHIFTED, SYMBOLS_SHIFTED);
-        // Enter symbol shift letter.
-        pressAndReleaseKey(CODE_SPACE, SYMBOLS_SHIFTED, SYMBOLS_SHIFTED);
-        // Enter switch back letter, switch back to alphabet shift locked.
-        pressAndReleaseKey(switchBackCode, SYMBOLS_SHIFTED, ALPHABET_SHIFT_LOCKED);
-    }
-
     // Automatic upper case test
     public void testAutomaticUpperCase() {
         // Set capitalize the first character of all words mode.
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateTestsBase.java b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateTestsBase.java
index c75f826..08199a0 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateTestsBase.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardStateTestsBase.java
@@ -22,8 +22,6 @@
         implements MockKeyboardSwitcher.MockConstants {
     protected MockKeyboardSwitcher mSwitcher;
 
-    private String mLayoutSwitchBackSymbols = "";
-
     @Override
     protected void setUp() throws Exception {
         super.setUp();
@@ -34,88 +32,86 @@
         loadKeyboard(ALPHABET_UNSHIFTED);
     }
 
-    public void setAutoCapsMode(int autoCaps) {
+    public void setAutoCapsMode(final int autoCaps) {
         mSwitcher.setAutoCapsMode(autoCaps);
     }
 
-    public void setLayoutSwitchBackSymbols(String switchBackSymbols) {
-        mLayoutSwitchBackSymbols = switchBackSymbols;
-    }
-
-    private static void assertLayout(String message, int expected, int actual) {
+    private static void assertLayout(final String message, final int expected, final int actual) {
         assertTrue(message + ": expected=" + MockKeyboardSwitcher.getLayoutName(expected)
                 + " actual=" + MockKeyboardSwitcher.getLayoutName(actual),
                 expected == actual);
     }
 
-    public void updateShiftState(int afterUpdate) {
+    public void updateShiftState(final int afterUpdate) {
         mSwitcher.updateShiftState();
         assertLayout("afterUpdate", afterUpdate, mSwitcher.getLayoutId());
     }
 
-    public void loadKeyboard(int afterLoad) {
-        mSwitcher.loadKeyboard(mLayoutSwitchBackSymbols);
+    public void loadKeyboard(final int afterLoad) {
+        mSwitcher.loadKeyboard();
         mSwitcher.updateShiftState();
         assertLayout("afterLoad", afterLoad, mSwitcher.getLayoutId());
     }
 
-    public void rotateDevice(int afterRotate) {
+    public void rotateDevice(final int afterRotate) {
         mSwitcher.saveKeyboardState();
-        mSwitcher.loadKeyboard(mLayoutSwitchBackSymbols);
+        mSwitcher.loadKeyboard();
         assertLayout("afterRotate", afterRotate, mSwitcher.getLayoutId());
     }
 
-    private void pressKeyWithoutTimerExpire(int code, boolean isSinglePointer, int afterPress) {
+    private void pressKeyWithoutTimerExpire(final int code, final boolean isSinglePointer,
+            final int afterPress) {
         mSwitcher.onPressKey(code, isSinglePointer);
         assertLayout("afterPress", afterPress, mSwitcher.getLayoutId());
     }
 
-    public void pressKey(int code, int afterPress) {
+    public void pressKey(final int code, final int afterPress) {
         mSwitcher.expireDoubleTapTimeout();
         pressKeyWithoutTimerExpire(code, true, afterPress);
     }
 
-    public void releaseKey(int code, int afterRelease) {
+    public void releaseKey(final int code, final int afterRelease) {
         mSwitcher.onCodeInput(code, SINGLE);
         mSwitcher.onReleaseKey(code, NOT_SLIDING);
         assertLayout("afterRelease", afterRelease, mSwitcher.getLayoutId());
     }
 
-    public void pressAndReleaseKey(int code, int afterPress, int afterRelease) {
+    public void pressAndReleaseKey(final int code, final int afterPress, final int afterRelease) {
         pressKey(code, afterPress);
         releaseKey(code, afterRelease);
     }
 
-    public void chordingPressKey(int code, int afterPress) {
+    public void chordingPressKey(final int code, final int afterPress) {
         mSwitcher.expireDoubleTapTimeout();
         pressKeyWithoutTimerExpire(code, false, afterPress);
     }
 
-    public void chordingReleaseKey(int code, int afterRelease) {
+    public void chordingReleaseKey(final int code, final int afterRelease) {
         mSwitcher.onCodeInput(code, MULTI);
         mSwitcher.onReleaseKey(code, NOT_SLIDING);
         assertLayout("afterRelease", afterRelease, mSwitcher.getLayoutId());
     }
 
-    public void chordingPressAndReleaseKey(int code, int afterPress, int afterRelease) {
+    public void chordingPressAndReleaseKey(final int code, final int afterPress,
+            final int afterRelease) {
         chordingPressKey(code, afterPress);
         chordingReleaseKey(code, afterRelease);
     }
 
-    public void pressAndSlideFromKey(int code, int afterPress, int afterSlide) {
+    public void pressAndSlideFromKey(final int code, final int afterPress, final int afterSlide) {
         pressKey(code, afterPress);
         mSwitcher.onReleaseKey(code, SLIDING);
         assertLayout("afterSlide", afterSlide, mSwitcher.getLayoutId());
     }
 
-    public void longPressKey(int code, int afterPress, int afterLongPress) {
+    public void longPressKey(final int code, final int afterPress, final int afterLongPress) {
         pressKey(code, afterPress);
         mSwitcher.onLongPressTimeout(code);
         assertLayout("afterLongPress", afterLongPress, mSwitcher.getLayoutId());
     }
 
-    public void longPressAndReleaseKey(int code, int afterPress, int afterLongPress,
-            int afterRelease) {
+    public void longPressAndReleaseKey(final int code, final int afterPress,
+            final int afterLongPress, final int afterRelease) {
         longPressKey(code, afterPress, afterLongPress);
         releaseKey(code, afterRelease);
     }
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/MockKeyboardSwitcher.java b/tests/src/com/android/inputmethod/keyboard/internal/MockKeyboardSwitcher.java
index 0213744..ac35585 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/MockKeyboardSwitcher.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/MockKeyboardSwitcher.java
@@ -61,7 +61,7 @@
         return mLayout;
     }
 
-    public static String getLayoutName(int layoutId) {
+    public static String getLayoutName(final int layoutId) {
         switch (layoutId) {
         case MockConstants.ALPHABET_UNSHIFTED: return "ALPHABET_UNSHIFTED";
         case MockConstants.ALPHABET_MANUAL_SHIFTED: return "ALPHABET_MANUAL_SHIFTED";
@@ -74,7 +74,7 @@
         }
     }
 
-    public void setAutoCapsMode(int autoCaps) {
+    public void setAutoCapsMode(final int autoCaps) {
         mAutoCapsMode = autoCaps;
         mAutoCapsState = autoCaps;
     }
@@ -139,7 +139,7 @@
     }
 
     @Override
-    public void startLongPressTimer(int code) {
+    public void startLongPressTimer(final int code) {
         mLongPressTimeoutCode = code;
     }
 
@@ -149,11 +149,11 @@
     }
 
     @Override
-    public void hapticAndAudioFeedback(int code) {
+    public void hapticAndAudioFeedback(final int code) {
         // Nothing to do.
     }
 
-    public void onLongPressTimeout(int code) {
+    public void onLongPressTimeout(final int code) {
         // TODO: Handle simultaneous long presses.
         if (mLongPressTimeoutCode == code) {
             mLongPressTimeoutCode = 0;
@@ -165,26 +165,26 @@
         mState.onUpdateShiftState(mAutoCapsState);
     }
 
-    public void loadKeyboard(String layoutSwitchBackSymbols) {
-        mState.onLoadKeyboard(layoutSwitchBackSymbols);
+    public void loadKeyboard() {
+        mState.onLoadKeyboard();
     }
 
     public void saveKeyboardState() {
         mState.onSaveKeyboardState();
     }
 
-    public void onPressKey(int code, boolean isSinglePointer) {
+    public void onPressKey(final int code, final boolean isSinglePointer) {
         mState.onPressKey(code, isSinglePointer, mAutoCapsState);
     }
 
-    public void onReleaseKey(int code, boolean withSliding) {
+    public void onReleaseKey(final int code, final boolean withSliding) {
         mState.onReleaseKey(code, withSliding);
         if (mLongPressTimeoutCode == code) {
             mLongPressTimeoutCode = 0;
         }
     }
 
-    public void onCodeInput(int code, boolean isSinglePointer) {
+    public void onCodeInput(final int code, final boolean isSinglePointer) {
         if (mAutoCapsMode == MockConstants.CAP_MODE_WORDS) {
             if (Constants.isLetterCode(code)) {
                 mAutoCapsState = (code == MockConstants.CODE_AUTO_CAPS_TRIGGER)
@@ -196,7 +196,7 @@
         mState.onCodeInput(code, isSinglePointer, mAutoCapsState);
     }
 
-    public void onCancelInput(boolean isSinglePointer) {
+    public void onCancelInput(final boolean isSinglePointer) {
         mState.onCancelInput(isSinglePointer);
     }
 }
\ No newline at end of file